Alan Jones trial: what does "grooming" mean for an adult?

At Alan Jones's Sydney trial, his lawyer argued that "grooming" — slowly manipulating someone into sexual compliance — happens to children, not adults. Complainant C, Jones's former driver, said he had been "groomed" into sending sexualised texts years after the alleged assaults. Jones, 85, denies 22 charges. The court must decide if grooming applies to adults.